Self-effacement (7)
I believe the answer is:
modesty
'self-effacement' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for modesty that I've seen before include "Humility; decency" , "Decorum, shyness" , "Way to get disorderly house under" , "Unpretentious style" , "Self-deprecating quality" .)